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ERA-Interim is produced and stored as spectral coefficients with a truncation of T639 T255 or on the N320 N128 reduced Gaussian grid (depending on the parameter), with 60 model levels. See ERA-Interim: What is the spatial reference
- ERA-40 has a resolution of T159 (triangular truncation of 159), N80 (80 latitude circles, pole to equator), L60 (model levels).
- ERA-15 has a resolution of T106 with 31 vertical hybrid levels.
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